JP3323303B2 - Zoom lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens. The zoom lens according to the present invention can be used as a photographing lens of a lens shutter camera or a photographing lens of a video camera.

[0002]

2. Description of the Related Art A high-magnification zoom lens is also desired for a lens shutter camera. Recently, a zoom lens having a zoom ratio of 2.5 or more has been desired. Further, with the downsizing of cameras, compactness of zoom lenses is also desired.

[0003] It is desirable that the zoom lens has a structure with a small number of moving groups from the viewpoint of compactness and simplification of the zoom mechanism. Japanese Patent Application Laid-Open No. 2-50118 discloses that the number of constituent groups is as small as two and that a zoom ratio of 2.5 or more is achieved.
However, this zoom lens has a large number of constituent elements of 10 to 11, and the back focus is extremely short. It was not enough to meet the request.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a small group structure of only two groups, and includes a wide angle of view of half angle of view: about 30 degrees. It is an object of the present invention to provide a compact zoom lens having a zoom ratio of 5 times or more and a small number of components of 7 lenses.

[0005]

As shown in FIG. 1, the zoom lens according to the present invention includes a first lens unit having a positive focal length on the object side (left side in FIG. 1). A zoom lens having a second group having a negative focal length disposed on the image side and performing zooming by changing the distance between the first and second groups.
The group includes, in order from the object side, a first lens 1 that is a positive meniscus lens having a convex surface facing the object side, and a second lens that is a biconcave lens.
A lens 2, a third lens 3, which is a biconvex lens, and a fourth lens 4, which is a biconvex lens, are arranged. The second group is a fifth meniscus lens which is a positive meniscus lens having a convex surface facing the image side in order from the object side. A lens 5, a sixth lens 6 as a negative lens, and a seventh lens 7 as a negative meniscus lens having a convex surface facing the image side are arranged. This lens configuration is a “basic lens configuration” for all zoom lenses described in claims 1 to 16.

In the zoom lens according to the first aspect of the present invention, in such a basic lens configuration, the focal length of the entire system at the long focal length end: f _T , the focal length of the first lens unit: f ₁ , and the focal length of the second lens unit: f ₂ , distance between the first and second lens groups at the long focal length end: d
₈ + _{d 9T} is, the condition _{(1) 0.27 <f 1 /} f T <0.31 (2) (d 8 + d 9T) / f T <0.035 (3) -1.1 <f 2 / f ₁ <−0.9 and a zoom ratio of 2.5 times or more .

In the zoom lens according to the second aspect, in addition to the configuration according to the first aspect, the radii of curvature of the object side surface and the image side surface of the sixth lens: r ₁₂ and r ₁₃ are defined by the following condition (4) -1. 4 <(r ₁₂ + r ₁₃ ) / (r ₁₂ −r ₁₃ ) <− 0.9.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the refractive index of the material of the second lens is n ₂ , the Abbe number of the material of the fourth lens is ν ₄ , 7
The Abbe number of the lens material: ν ₇ satisfies the condition (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0.

According to a fourth aspect of the present invention, in the zoom lens according to the first aspect, the third lens has an aspheric image side surface.

[0010] The zoom lens according to claim 5, wherein, in addition to the configuration of the fourth aspect, the curvature of the object side surface and image side surface of the sixth lens radius: r ₁₂ and r ₁₃ is the condition (4) -1.4 _{<(r 12 + r 13)} / (r 12 -r 13) <- and satisfying 0.9.

The zoom lens according to the present invention includes a zoom lens in which one or more lens surfaces employ an "aspheric surface". In such a case, the X-axis is taken with the direction toward the image side as the positive, and the height: H is taken in the direction orthogonal to the optical axis, with the intersection point between the lens surface having the aspherical surface and the optical axis taken as the origin, and the aspherical surface taken. To X
(H), and the curvature of the lens surface on the optical axis is C (= 1).
/ R). r is, of course, the radius of curvature on the optical axis. When these X (H) and C are expressed in relation to the adopted lens surfaces, the numbers of the lens surfaces (surface numbers counted from the object side) are added as suffixes.

According to a sixth aspect of the present invention, in addition to the configuration of the fourth or fifth aspect, the image side surface of the third lens having an aspherical surface: X ₆ (H) and C ₆ are subject to the condition (1). 8) It is characterized by satisfying X ₆ (H)> C ₆ H ² / {1 + {(1-C ₆ ² H ² )}.

According to a seventh aspect of the present invention, there is provided a zoom lens according to the fourth or fifth or sixth aspect, further comprising: a refractive index of the material of the second lens: n ₂ , and an Abbe number of the material of the fourth lens:
ν ₄ , Abbe number of the material of the seventh lens: ν ₇ satisfies the condition (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0. And

An eighth aspect of the present invention is the zoom lens according to the first aspect, wherein the object side surface of the fourth lens is aspherical.

[0015] The zoom lens according to claim 9, wherein, in addition to the above-described configuration according to claim 8, curvature of the object side surface and image side surface of the sixth lens radius: r ₁₂ and r ₁₃ is the condition (4) -1. 4 <(r ₁₂ + r ₁₃ ) / (r ₁₂ −r ₁₃ ) <− 0.9.

According to a tenth aspect of the present invention, in addition to the configuration of the eighth or ninth aspect, the object side surface of the fourth lens having an aspheric surface: X ₇ (H) and C ₇ are satisfied by the condition (9). ) X ₇ (H) <and satisfies the ^{_{C 7 H 2 / {1 +}} √ (1-C 7 2 H 2)}.

According to an eleventh aspect of the present invention, in addition to the configuration of the eighth, ninth or tenth aspect, the refractive index of the material of the second lens is n ₂ , and the Abbe number of the material of the fourth lens is ν _4. Abbe number: ν ₇ of the material of the seventh lens satisfies the condition (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0. .

According to a twelfth aspect of the present invention, in the zoom lens of the first aspect, the fourth lens has an aspherical image side surface.

[0019] The zoom lens according to claim 13, wherein, in addition to the above-described configuration according to claim 12, the curvature of the object side surface and image side surface of the sixth lens radius: r ₁₂ and r ₁₃ are satisfied condition wherein the (4) It is characterized by doing.

According to a fourteenth aspect of the present invention, in addition to the configuration of the twelfth or thirteenth aspect, the image side surface: X ₈ (H) and C _{8 of} the fourth lens having an aspherical surface are subject to the condition (10). ) and satisfies the _{X 8 (H)> C 8} H 2 / {1 + √ (1-C 8 2 H 2)}.

According to a fifteenth aspect of the present invention, in addition to the configuration of the twelfth aspect, the refractive index of the material of the second lens is n ₂ , and the Abbe number of the material of the fourth lens is ν _4. An Abbe number: ν ₇ of the material of the seventh lens satisfies the conditions (5) to (7).

A zoom lens according to claim 16 is the zoom lens according to any one of claims 1 to 15,
The second lens (biconcave lens) and the third lens (biconvex lens) of the first group may be configured as a “laminated lens”.

FIG. 9 shows a basic lens configuration of a zoom lens according to claim 16 according to FIG. The difference from the zoom lens according to claim 1 is that, as described above, the second lens 2 and the third lens
In this zoom lens, the distance between the first and second lens _{units at} the long focal length end is “d ₇ + d _8T ”, and the entire system at the long focal length end is located. Focal length: f _T , focal length of the first group: f
_1, the focal length of the second lens group: with _{f 2,} condition _{(1) 0.27 <f 1 /} f T <0.31 (2 ') (d 7 + d 8T) / f T <0.035 (3) -1.1 _<to satisfy the f ₂ / f 1 <-0.9. The zoom lens according to claim 16 also has a size of 2.5.
It has a zoom ratio of 2 times or more.

[0024] In addition to the above configuration of the zoom lens according to claim 16, wherein, the curvature of the object side surface and image side surface of the sixth lens radius: r ₁₁ and r ₁₂ are, condition (4 ') -1.4 <(r 11 + r ₁₂ ) / (r ₁₁ −r ₁₂ ) <− 0.9.

In the zoom lens according to the present invention, in addition to the above conditions (1), (2 '), (3) or these and the condition (4'), the refractive index of the material of the second lens: n ₂ ,
The Abbe number of the fourth lens material: ν ₄ and the Abbe number of the seventh lens material: ν ₇ can satisfy the above conditions (5) to (7).

In the zoom lens according to the present invention, the image side surface of the third lens may be aspheric.

In this case, the radii of curvature of the object side surface and the image side surface of the sixth lens: r ₁₁ and r ₁₂ satisfy the condition (4 ′).
Can be satisfied.

According to a sixteenth aspect of the present invention, in addition to the above-described configuration, the image side surface of the third lens employing an aspherical surface: X ₅ (H) and C ₅ satisfy the condition (8 ′) X _{5 (H)> C 5 H} 2 / {1 + √ (1-C 5 2 H 2)} can be satisfied.

According to a sixteenth aspect of the present invention, in addition to the above-mentioned components, the refractive index of the material of the second lens is n.
_2. The Abbe number of the material of the fourth lens: ν ₄ and the Abbe number of the material of the seventh lens: ν ₇ can satisfy the above conditions (5) to (7).

In the zoom lens according to the sixteenth aspect, the object side surface of the fourth lens can be made aspherical.

In this case, the radii of curvature of the object side surface and the image side surface of the sixth lens: r ₁₁ and r ₁₂ satisfy the condition (4 ′).
Can be satisfied.

Further, the object side surface of the fourth lens employing the aspherical surface: X ₆ (H) and C ₆ satisfy the condition (9 ′) X ₆ (H) <C ₆ H ² / {1 +} (1 −C ₆ ² H ² )｝ can be satisfied.

According to a sixteenth aspect of the present invention, in addition to the above configuration, the refractive index of the material of the second lens is n ₂ , the Abbe number of the material of the fourth lens: ν ₄ , and the Abbe number of the material of the seventh lens. : Ν ₇ can satisfy the above conditions (5) to (7).

In the structure of the zoom lens according to the sixteenth aspect, the image side surface of the fourth lens can be made aspherical.

In this case, the radius of curvature of the object side surface and the image side surface of the sixth lens: r ₁₁ and r ₁₂ satisfy the condition (4 ′).
Can be satisfied.

Further, the image side surface of the fourth lens adopting the aspherical surface: X ₇ (H) and C ₇ satisfy the condition (10 ′) X ₇ (H)> C ₇ H ² / {1 +} (1- C ₇ ² H ² )｝ can be satisfied.

In the zoom lens according to the present invention, the refractive index of the material of the second lens: n ₂ , the Abbe number of the material of the fourth lens: ν ₄ , the Abbe number of the material of the seventh lens: ν ₇ can satisfy the above conditions (5) to (7).

In the zoom lens according to the first aspect, the above-described lens configuration is referred to as a "basic lens configuration", and the "third lens configuration"
The image side surface of the lens 3 and the image side surface of the fifth lens 5 can be aspherical. "

In this case, the focal length of the entire system at the long focal end: f _T , the focal length of the first lens unit: f ₁ , and the focal length of the second lens unit:
f ₂ , distance between the first and second lens groups at the long focal end: d ₈ + d _9T
Can satisfy the conditions (1) to (3) as in the zoom lens according to the first aspect.

Further, the radius of curvature r ₁₂ and r _{13 of} the sixth lens 6 on the object side surface and the image side surface can satisfy the above condition (4).

Further, in addition to the above configuration, X ₆ (H) and C _{6 on} the image side surface of the third lens 3 employing an aspheric surface, the fifth
X ₁₁ (H) and C _{11 on} the image side surface of the lens 5 are, together with the condition (8), the condition (11) X ₁₁ (H) <C ₁₁ H ² / {1 +} (1-C ₁₁ ² H ² ) ｝ Can be satisfied.

Further, in addition to the above-mentioned constitution, the refractive index of the material of the second lens 2: n ₂ , the Abbe number of the material of the fourth lens 4: ν ₄ , the Abbe number of the material of the seventh lens 7: ν ₇ However, the conditions (5) to (7) can be added.

In the "basic lens configuration" of the zoom lens according to the first aspect, the object side surface of the fourth lens 4 and the image side surface of the fifth lens 5 can be aspherical. In this case, the curvature of the object side surface and image side surface of the sixth lens 6 radius can be r ₁₂ and r ₁₃ are, satisfies the condition (4).

Further, X on the object side surface of the fourth lens
₇ (H) and C ₇ , and X ₁₁ (H) and C _{11 on} the image side surface of the fifth lens 5 can satisfy the above conditions (9) and (11).

In addition to these configurations, the refractive index of the material of the second lens: n ₂ , the Abbe number of the material of the fourth lens: ν ₄ , and the Abbe number of the material of the seventh lens: ν ₇ 5)-
(7) can be satisfied.

In the zoom lens according to the first aspect of the present invention, the image side surface of the fourth lens 4 and the image side surface of the fifth lens 5 can be aspherical in the basic lens configuration.

In this case, the radius of curvature r ₁₂ and r ₁₃ of the object side surface and the image side surface of the sixth lens 6 can satisfy the above condition (4).

In addition to these structures, X ₆ (H) and C _{8 on} the image side surface of the fourth lens 4 and X ₁₁ (H) and C _{11 on} the image side surface of the fifth lens 5 satisfy the above condition ( 10), (1
1) can be satisfied.

Further, in addition to the above configuration, the refractive index of the material of the second lens 2 is n ₂ , and the Abbe number of the material of the fourth lens 4 is:
ν ₄ , Abbe number of the material of the seventh lens 7: ν ₇ can satisfy the above conditions (5) to (7).

In the basic lens configuration of the zoom lens according to the first aspect, the image side surface of the fourth lens 4 and the object side surface and the image side surface of the fifth lens 5 can be aspherical.

In this case, the radii of curvature of the sixth lens 6 on the object side surface and the image side surface: r ₁₂ and r ₁₃ satisfy the condition (4).
Can be satisfied.

Further, in addition to the above components, the fourth lens 4
X ₈ (H) and C ₈ on the image side, and X ₁₀ (H) and C _{10 on} the object side and image side of the fifth lens 5 satisfy the above condition (10), and X ₁₁ (H) and C ₁₁ but the condition _{(12) X 11 (H)} -X 10 (H) <[C 11 H 2 / {1 + √ (1-C 11 2 H 2)}] - [C 10 H 2 / {1 + √ (1 −C ₁₀ ² H ² )}].

Further, in addition to the above-described configuration, the refractive index of the material of the second lens 2 is n ₂ , the Abbe number of the material of the fourth lens 4 is ν ₄ , and the Abbe number of the material of the seventh lens 7 is ν _7. However, the conditions (5) to (7) can be satisfied.

In the above-mentioned "basic lens structure" of the zoom lens according to claim 1, a lens in which the second lens (biconcave lens) and the third lens (biconvex lens) of the first group are "laminated lenses". It can be configured.

In such a lens configuration, "the image side surface of the third lens 3 and the image side surface of the fifth lens 5 are aspheric" can be provided.

In this case, the focal length of the entire system at the long focal end: f _T , the focal length of the first lens unit: f ₁ , and the focal length of the second lens unit:
f ₂ , distance between the first and second lens groups at the long focal end: d ₇ + d _8T
Can satisfy the above conditions (1), (2 ′) and (3), similarly to the zoom lens according to the sixteenth aspect.

In addition to such a configuration, the sixth lens 6
The radius of curvature of the object side surface and the image side surface: r ₁₁ and r ₁₂ are:
The above condition (4 ′) can be satisfied.

In addition to the above configuration, X ₅ (H) and C _{5 on} the image side surface of the third lens 3 satisfy the above condition (8 ′), and X ₁₀ (H) on the image side surface of the fifth lens 5. ) And C ₁₀ can satisfy the condition (11 ′) X ₁₀ (H) <C ₁₀ H ² / {1 + {(1-C ₁₀ ² H ² )}.

Further, in addition to the above configuration, the second lens 2
N ₂ , Abbe number of the material of the fourth lens 4: ν ₄ , Abbe number of the material of the seventh lens 7: ν ₇ satisfies the above conditions (5) to (7). it can.

In the “basic lens configuration”, the object side surface of the fourth lens 4 and the image side surface of the fifth lens 5 can be aspherical.

In this case, the radii of curvature r ₁₁ and r ₁₂ of the object side surface and the image side surface of the sixth lens 6 can satisfy the above condition (4 ′).

Further, in addition to the above configuration, X ₆ (H) and C _{6 on} the object side surface of the fourth lens, and X ₁₀ (X _{10) on} the image side surface of the fifth lens 5.
(H) and C ₁₀ satisfy the above conditions (9 ′) and (11 ′)
Can be satisfied.

Further, in addition to the above structure, the refractive index of the material of the second lens: n ₂ , the Abbe number of the material of the fourth lens: ν ₄ ,
Abbe number of the material of the seventh lens: ν ₇ is the above condition (5)
To (7) can be satisfied.

In the basic lens configuration, the image side surface of the fourth lens 4 and the image side surface of the fifth lens 5 can be aspherical.

In this case, the radii of curvature r ₁₁ and r ₁₂ of the object side surface and the image side surface of the sixth lens 6 can satisfy the above condition (4 ′).

Further, in addition to the above configuration, X ₇ (H) and C _{7 on} the image side surface of the fourth lens 4 and X ₇ (H) on the image side surface of the fifth lens 5
₁₀ (H) and C ₁₀ can satisfy the conditions (10 ′) and (11 ′).

Further, in addition to the above-described structure, the refractive index of the material of the second lens 2 is n ₂ , the Abbe number of the material of the fourth lens 4 is ν ₄ , and the Abbe number of the material of the seventh lens 7 is ν ₇ However, the conditions (5) to (7) can be satisfied.

In the basic lens configuration, the image side surface of the fourth lens 4 and the object side surface and the image side surface of the fifth lens 5 can be aspherical.

In this case, the radii of curvature r ₁₁ and r ₁₂ of the object side surface and the image side surface of the sixth lens 6 can satisfy the above condition (4 ′).

Further, in addition to the above configuration, X ₇ (H) and C _{7 on} the image side surface of the fourth lens 4, and the object side surface of the fifth lens 5.
X ₉ (H) and C _{9 on the} image side surface satisfy the condition (10 ′), and X ₁₀ (H) and C ₁₀ satisfy the condition (12 ′) X ₁₀ (H) −X ₉ (H) <[ ^{_{C 10 H 2 / {1 +}} √ (1-C 10 2 H 2)}] - [C 9 H 2 / {1 + √ (1-C 9 2 H 2)}] can be satisfied.

Further, in addition to the above configuration, the second lens 2
Refractive index: n ₂ , Abbe number of the material of the fourth lens 4: ν ₄ , Abbe number of the material of the seventh lens 7: ν ₇ satisfy the above conditions (5) to (7). it can.

In summary, in the zoom lens according to the present invention, the lens configuration described in claim 1 is referred to as a “basic lens configuration”. In the zoom lens described in claim 16, the second and third lenses of the first group are provided. The lens is a “laminated lens”.

In the case where the second lens and the third lens are not cemented lenses (claims 1 to 15) and the case where they are cemented lenses, the order of the lens surfaces of the third lens below the object side surface is only one. On the other hand, if the lens is a laminated lens, the conditions (2), (4),
(8), (9), (10), (11) and (12)
Are the conditions (2 ′), (4 ′), (8 ′),
(9 '), (10'), (11 ') and (12'). The condition with a dash and the condition without a dash are the same condition, and are merely different in terms of expression due to the different surface order of the same lens surface.

[0074]

As described above, according to the present invention, the first group having a positive focal length is arranged on the object side, and the second group having a negative focal length is arranged on the image side. This is a two-group zoom lens of the type. By adopting this configuration, the back focus is shortened, and a compact and simple configuration zoom lens suitable for a camera having no back focus restriction such as a lens shutter camera can be realized.

In a zoom lens of the type described above, the first and second lens units come closest to each other at the long focal length end, and have the shortest back focus at the short focal length end. According to the present invention, the first group is sequentially formed from the object side with a positive, negative, positive, and positive lens configuration, so that the rear principal point of the first group is located on the image side as much as possible, By effectively shortening the distance between the second group and the front principal point, a large zoom ratio is realized.

In the zoom lens described in claim 4 and the following claims, in order to shorten the overall length and effectively correct various aberrations caused by this, at least one of each of the first and second groups is provided. Aspherical surface is adopted.

In a telephoto type two-unit zoom lens such as the zoom lens of the present invention, it is necessary to increase the power of both the first and second units in order to suppress an increase in the total length. However, if the power of these groups is increased without limit, the amount of movement of the image plane with respect to the amount of movement of the groups increases, and the positional accuracy of each group with respect to the image plane (film surface) becomes extremely severe.

The condition (1) is a condition that defines the “power of the first lens unit”. If the parameter: f ₁ / f _T exceeds the upper limit, the overall length of the lens becomes longer, and compactness cannot be realized. On the other hand, if the lower limit is exceeded, the accuracy of each group on the image plane becomes severe, and high-precision control is required, so that the moving mechanism becomes complicated and the cost increases.

In order to obtain a large zoom ratio with a zoom lens of the type according to the present invention, as described above, the distance between the rear principal point of the first group and the front principal point of the second group is kept small at the long focal end. There is a need. In the zoom lens of the present invention, the necessity is further increased because the power of the first lens group is suppressed to some extent by the above condition (1).

The condition (2) or (2 ′) defines “the distance between the first and second lens groups at the long focal length end”.
Parameter: (d ₈ + d _9T ) / f _T or (d ₇ +
If d _8T ) / f _T exceeds the upper limit, it becomes difficult to realize a zoom ratio of 2.5 times or more.

In order to take a large zoom ratio while suppressing an increase in the overall length of the lens, and to prevent the back focus at the short focal length end from becoming extremely short, it is necessary to reduce the amount of group movement during zooming. is important. In order to reduce the amount of relative movement of the second unit during zooming with respect to the first unit,
The negative power of the group must be equal to or stronger than the positive power of the first group.

The condition (3) defines the “ratio of the power of the first and second units”. When the parameter f ₂ / f ₁ exceeds the lower limit, the relative position of the second unit to the first unit is reduced. The amount of movement increases, and the overall length of the lens becomes longer, and the back focus at the short focal length end becomes extremely short, which is not preferable. When the value exceeds the upper limit, the Petzval sum becomes excessively small,
The image plane falls to the positive side, and the off-axis performance deteriorates.

The condition (4) or (4 ′) defines the shape of the sixth lens, and has the parameter: (r ₁₂ +
r ₁₃ ) / (r ₁₂ −r ₁₃ ) or (r ₁₁ + r ₁₂ ) / (r
_{If 11} −r ₁₂ ) exceeds the upper limit, it becomes difficult to satisfactorily correct the curvature of field. If the lower limit is exceeded, the rear principal point of the second group moves to the object side, and the back focus at the short focal length end is reduced. This shortens the size of the lens and causes an increase in the size of the lens close to the image plane.

The condition (5) defines the refractive index of the material of the second lens, and the conditions (6) and (7) define the Abbe number of the material of the fourth lens and the seventh lens, respectively. Things. By satisfying these conditions (5), (6), and (7), chromatic aberration and field curvature can be corrected in a well-balanced manner, and higher performance can be obtained.

As described above, in the zoom lens described in claim 4 or later, in order to shorten the total length by increasing the power of the first and second lens units and satisfactorily correct various aberrations accompanying the shortening of the total length, One or more aspherical surfaces are employed.

Conditions (8) to (12) or (8 ')
(12 ') defines the shape of each adopted aspherical surface.

The condition (8) or (8 ′) indicates that the shape of the aspherical surface adopted on the image side surface of the third lens is a shape in which “the positive refractive power becomes weaker toward the lens periphery”. ing.

The condition (9) or (9 ′) indicates that the shape of the aspherical surface employed on the object side surface of the fourth lens is such that “the positive refractive power becomes weaker toward the lens periphery”. ing.

Condition (10) or (10 ′) is the fourth condition.
This indicates that the shape of the aspherical surface employed on the image side surface of the lens is a shape in which "positive refractive power decreases as going toward the lens periphery".

The condition (11) or (11 ′) is the fifth condition.
This indicates that the shape of the aspherical surface adopted on the image side surface of the lens is a shape that “positive refractive power increases toward the periphery of the lens”.

When an aspheric surface is used for the object side surface and the image side surface of the fifth lens, the condition (12) or (12 ′) is satisfied.
Defines the lens shape of the fifth lens having aspherical surfaces on both sides.

The fifth lens is a positive meniscus lens having a convex surface facing the image side as described above. The condition (12) or (12 ') satisfies the positive refractive power of the fifth lens which is a positive meniscus lens. Indicates that each aspherical surface is formed such that “increases toward the lens periphery”.

According to the position where the aspherical surface is adopted, the above condition (8)
By satisfying 〜 (12), (8 ′) １２ (12 ′), it is possible to effectively correct the occurrence of aberration due to the shortening of the entire length of the lens.

That is, conditions (8)-(10), (8 ')-
By satisfying the condition (10 ′), it is possible to effectively remove the “spherical aberration” generated due to the shortening of the total length.
By satisfying (11 ′), (12), and (12 ′), “field curvature and astigmatism” that occurs with shortening of the overall length can be more effectively removed.

[0095]

EXAMPLES Hereinafter, 32 specific examples will be given.

As shown in FIG. 1, the i-th counting from the object side
The radius of curvature of the th surface (including the diaphragm surface) is defined as r _i (i = 1 to
15), the i-th surface and the surface interval on the optical axis between the i + 1-th surface d _i (i = 1 to 14), counted from the object side the j
The refractive index and Abbe number of the material of the second lens are represented by n _j and ν _j (j = 1 to 7).

F represents the focal length of the entire system, F / No represents the brightness, and ω represents the half angle of view.

As is well known, the aspherical surface is aligned with the optical axis so that X
When taking the coordinates and setting the H coordinate perpendicular to the optical axis,
When the curvature radius on the optical axis r (inverse of the aforementioned C), the conic constant K, the aspherical coefficients of higher order A, B, C, and D, X = (1 / r ) H 2 / { 1 + {[1- (1 + K) (H / r) ² ]} + A · H ⁴ + B · H ⁶ + C · H ⁸ + D · H ^{10 A} curved surface obtained by rotating the curve around the optical axis. Yes, the shape is specified by giving a radius of curvature on the optical axis, a conical constant, and a higher order aspheric coefficient. In the display of the aspheric coefficient, E and the number following it indicate exponentiation. That is, for example, "E-9" means 1/10 ⁹ and this number is multiplied by the numerical value preceding it.

In conditional expressions (1) to (12 '),
The values of the conditions (5), (6), and (7) are given as “specification values” in each embodiment, and the conditions (8) to (12),
Since (8 ′) to (12 ′) are satisfied in each of the embodiments, the values of the parameters of the conditional expressions are the conditions (1), (2), (2 ′), (3), 4), (4 ')
List the things about.

In the first to eighth embodiments, the first and second embodiments are embodiments of the zoom lens according to claims 1, 2, and 3, and the third and fourth embodiments are claims 4, 5, 6, and 7. Embodiments of the zoom lens of the present invention, and Embodiments 5 and 6 are claimed in claims 8, 9, 10,
The zoom lens according to the eleventh embodiment and the seventh and eighth embodiments are embodiments of the zoom lens according to the twelfth, thirteenth, fourteenth, and fifteenth aspects.

[0102] Example 1 f = 39.2~102.0, F / No = 4.6~9.1, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 20.783 2.08 1 1.73011 39.01 2 39.742 3.20 3 -149.85 1.50 2 1.88300 40.80 4 21.145 0.11 5 21.804 5.00 3 1.60053 57.12 6 -14.639 0.14 7 34.234 3.474 4 1.48749 70.44 8 -23.199 0.50 9 (Aperture) Variable 10 -43.387 3.07 5 1.83310 34.44 11 -18.838 2.10 12 -16.695 1.50 6 1.82123 44.23 13 -16.834 3.59 14 -16.807 1.50 7 1.48749 70.44 15 -3 5.368.

[0102] variable amount _{f 39.176 63.214 102.043 d 9 17.00 8.05} 2.50.

Values of parameters of conditional expression f ₁ / f _T = 0.288, (d ₈ + d _9T ) / f _T = 0.02
_{94, f 2 / f 1 =} -1.066, (r 12 + r 13) / (r 12 -r
₁₃ ) = − 1.232 FIG. 1 shows a lens configuration diagram of the zoom lens of the first embodiment.

[0104] Example 2 f = 39.2~102.0, F / No = 4.6~9.0, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 20.431 2.05 1 1.80610 40.73 2 38.579 2.43 3 -16.314 1.50 2 1.88300 40.80 4 21.365 0.12 5 22.259 5.00 3 1.56883 56.04 6 -14.896 0.98 7 35.352 3.42 4 1.48749 70.44 8-23.437 0.509 (Aperture) Variable 10 -59.0076 3.26 5 1.83400 37.34 11 -18.910 1.67 12 -17.007 1.50 6 1.83500 42.98 13 -297.004 3.72 14 -16.040 1.50 7 1.48749 70.44 15 -4 2.194.

[0105] variable amount _{f 39.165 63.222 102.049 d 9 16.54 7.87} 2.50.

Parameter values f ₁ / f _T = 0.288, (d ₈ + d _9T ) / f _T = 0.0294, f ₂ / f ₁ = −1.032, (r ₁₂ + r ₁₃ ) / (R ₁₂ -r ₁₃ ) = − 1.121 FIG. 2 shows a lens configuration diagram of the zoom lens according to the second embodiment.

[0107] Example 3 f = 39.2~101.9, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 18.487 2.00 1 1.62004 36.30 2 34.505 1.86 3 -16.948 1.50 2 1.88300 40.80 4 29.671 0.10 5 29.521 4.72 3 1.58913 61.25 6-20.948 0.10 7 44.524 3.954 1.48749 70.44 8-15.815 0.509 (Aperture) Variable 10-42.670 2.85 5 1.78590 43.93 11 -19.485 2.33 12 -18.058 1.50 6 1.71300 53.94 13 337.171 3.82 14 -15.598 1.50 7 1.48749 70.44 15 -4 2.133.

[0108] variable amount _{f 39.151 63.159 101.901 d 9 16.27 7.77} 2.50.

Aspherical surface (Sixth surface) K = −2.13335, A = 8.414116E-6 B = 1.69615E-7, C = 2.17280E-9, D = 1.09826E-12.

[0110] Condition parameter value _{f 1 / f T = 0.286,} (d 8 + d 9T) / f T = 0.0294, f 2 / f 1 = -1.032, (r 12 + r 13) / (R ₁₂ −r ₁₃ ) = − 1.113 FIG. 3 shows a lens configuration diagram of the zoom lens of the third embodiment.

[0111] Example 4 f = 39.0~101.6, F / No = 4.6~9.2, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 18.210 2.12 1 1.56732 42.84 2 46.668 1.743 3-16.094 1.50 2 1.83500 42.98 4 16.215 0.12 5 16.720 4.45 3 1.58913 61.25 6-18.435 0.10 7 81.333 4.47 4 1.58313 59.468 8-17.868 0.509 (Aperture) Variable 10-55.016 2.84 5 1.70154 41.15 11 -20.780 2.60 12 -19.080 1.50 6 1.74330 49.22 13 -999.983 3.65 14 -16.991 1.50 7 1.51680 64.20 15 -4 2.013.

[0112] variable amount _{f 39.012 62.923 101.586 d 9 16.44 7.84} 2.50.

Aspherical surface (sixth surface) K = -0.17104, A = 6.18063E-6 B = -1.21530E-7, C = 3.50072E-9, D = -3.87097E-11.

[0114] Condition parameter value _{f 1 / f T = 0.289,} (d 8 + d 9T) / f T = 0.0295, f 2 / f 1 = -1.023, (r 12 + r 13) / (R ₁₂ −r ₁₃ ) = − 1.039 FIG. 4 shows a lens configuration diagram of the zoom lens of the fourth embodiment.

[0115] Example 5 f = 39.1~101.8, F / No = 4.6~9.1, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 15.404 2.06 1 1.60342 38.01 2 24.519 2.263 -16.526 1.50 2 1.88300 40.80 4 21.017 0.13 5 19.014 4.84 3 1.58913 61.25 6-18.425 0.107 749.279 3.34 4 1.58913 61.25 8-21.326 0.509 (Aperture) Variable 10-42.342 2.83 5 1.70200 40.20 11 -19.183 2.74 12 -17.728 1.50 6 1.77250 49.62 13 -146.802 3.62 14 -16.287 1.50 7 1.48749 70.44 15 -3 7.425.

[0116] variable amount _{f 39.131 63.102 101.809 d 9 16.47 7.85} 2.50.

Aspherical surface (seventh surface) K = -11.998800, A = -1.4448E-5 B = -3.664309E-8, C = -3.68864E-9, D = 1.53652E-11 .

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₈ + d _9T ) / f _T = 0.0295, f ₂ / f ₁ = −1.028, (r ₁₂ + r ₁₃ ) / (R ₁₂ −r ₁₃ ) = − 1.275 FIG. 5 shows a lens configuration diagram of the fifth embodiment.

[0119] Example 6 f = 39.2~101.9, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 17.867 2.11 1 1.56732 42.84 2 42.334 1.86 3 -16.014 1.50 2 1.83500 42.98 4 16.154 0.10 5 15.971 4.48 3 1.58913 61.25 6-18.210 0.82 7 71.346 3.20 4 1.58313 59.468 -18.922 0.509 (Aperture) Variable 10-54.159 2.83 5 1.70154 41.15 11 -20.712 2.64 12 -18.964 1.50 6 1.74330 49.22 13 -949.861 3.68 14 -16.853 1.80 7 1.51680 64.20 15 -4 0.884.

[0120] variable amount _{f 39.158 63.156 101.889 d 9 16.37 7.81} 2.50.

Aspherical surface (sixth surface) K = 20.70710, A = −2.23797E-5, B = 3.2285E-7, C = −1.12701E-8, D = 8.999475E-11.

[0122] Condition parameter value _{f 1 / f T = 0.289,} (d 8 + d 9T) / f T = 0.0294, f 2 / f 1 = -1.020, (r 12 + r 13) / (R ₁₂ −r ₁₃ ) = − 1.041 FIG. 6 shows a lens configuration of the zoom lens of the sixth embodiment.

[0123] Example 7 f = 39.2~101.9, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.679 2.02 1 1.54844 45.82 2 28.694 1.58 3 -15.302 1.50 2 1.88300 40.80 4 76.840 0.14 5 93.549 4.43 3 1.51823 58.96 6 -15.572 0.10 7 32.101 3.64 4 1.48749 70.44 8-20.689 0.509 (Aperture) Variable 10-34.410 2.95 5 1.700003 47.20 11 -17.687 3.02 12 -15.921 1.50 6 1.69680 55.46 13 129.918 3.46 14 -17.492 1.807 7 1.48749 70.44 15 -3 6.622.

[0124] Variable amounts _{f 39.233 63.225 101.854 d 9 16.79 7.97} 2.50.

Aspherical surface (eighth surface) K = −1.58925, A = 7.27682E-6 B = −4.56811E-8, C = 2.434385E-9, D = −1.69026E-11.

[0126] Condition parameter value _{f 1 / f T = 0.289,} (d 8 + d 9T) / f T = 0.0295, f 2 / f 1 = -1.056, (r 12 + r 13) / (R ₁₂ −r ₁₃ ) = − 1.279 FIG. 7 shows a lens configuration diagram of the zoom lens of the seventh embodiment.

[0127] Example 8 f = 39.1~101.7, F / No = 4.6~9.2, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 19.007 2.10 1 1.56732 42.84 2 49.557 1.76 3 -15.841 1.50 2 1.83500 42.98 4 16.644 0.10 5 15.838 5.00 3 1.58913 61.25 6-17.255 0.60 7 65.892 3.44 4 1.58313 59.46 8-21.700 0.509 (Aperture) Variable 10-49.920 2.78 5 1.70154 41.15 11 -20.647 2.97 12 -8.013 1.50 6 1.74330 49.22 13 -432.626 3.25 14 -18.814 1.80 7 1.51680 64.20 15 -4 4.515.

Variable f 39.107 63.076 101.658 d ₉ 16.49 7.85 2.50.

Aspherical surface (eighth surface) K = −0.48075, A = 6.555255E-6 B = −7.08462E-8, C = 3.17325E-9, D = 1.96026E-11.

Values of the parameters of the conditional expression f ₁ / f _T = 0.289, (d ₈ + d _9T ) / f _T = 0.0295, f ₂ / f ₁ = −1.029, (r ₁₂ + r ₁₃ ) / (R ₁₂ −r ₁₃ ) = − 1.087 FIG. 8 shows the lens configuration of the zoom lens according to the eighth embodiment.

Embodiments 9 to 16 described below are embodiments of the zoom lens according to the present invention. r _i ,
d _i , n _j , and v _j are as shown in FIG.

[0132] Example 9 f = 39.2~102.0, F / No = 4.5~9.0, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 19.559 2.06 1 1.72336 37.27 2 33.573 2.87 3 -15.330 1.50 2 1.88300 40.80 4 20.954 5.00 3 1.60997 55.95 5-1.669 0.84 6 31.005 3.42 4 1.48749 70.44 7 -25.927 0.508 (Aperture) Variable 9-43.727 3.11 5 1.83821 35.31 10-18.463 1.93 11 -16.780 1.50 6 1.83500 43.012 -11.762 3.58 13 -15.868 1.50 7 1.48749 70.44 14 -39. 754.

Variable f 39.160 63.172 101.968 d ₈ 16.76 7.96 2.50.

[0134] Condition parameter value _{f 1 / f T = 0.288,} (d 7 + d 8T) / f T = 0.0294, f 2 / f 1 = -1.049, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.346 FIG. 9 shows a lens configuration diagram of the zoom lens of the ninth embodiment.

[0135] Example 10 f = 39.1~101.8, F / No = 4.6~8.9, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 21.276 2.04 1 1.80610 40.73 2 40.701 2.57 3 -15.416 1.50 2 1.88300 40.80 4 22.883 5.00 3 1.56883 56.04 5-13.978 1.02 6 33.098 3.37 4 1.48749 70.44 7 -25.635 0.508 (Aperture) Variable 9-59.982 3.27 5 1.83700 37.34 10-18.865 1.60 11 -17.230 1.50 6 1.83500 42.98 12-227.038 3.59 13-16.063 1.50 7 1.48749 70.44 14-51. 106.

[0136] variable amount _{f 39.135 63.125 101.761 d 8 16.41 7.82} 2.50.

[0137] Condition parameter value _{f 1 / f T = 0.289,} (d 7 + d 8T) / f T = 0.0295, f 2 / f 1 = -1.023, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.164 FIG. 10 shows a lens configuration diagram of the zoom lens of the tenth embodiment.

[0138] Example 11 f = 39.1~101.9, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 18.4747 2.00 1 1.62004 36.30 2 33.175 1.97 3 -17.030 1.50 2 1.88300 40.80 4 30.802 5.00 3 1.58913 61.25 5-21.081 0.10 6 41.541 3.86 4 1.48749 70.44 7 -16.225 0.508 (Aperture) Variable 9-44.247 2.91 5 1.78590 43.93 10-19.618 2.30 11 -18.011 1.50 6 1.71300 53.94 12-348.067 3.82 13 -16.013 1.50 7 1.48749 70.44 14 -44. 083.

[0139] variable amount _{f 39.142 63.148 101.933 d 8 16.63 7.91} 2.50.

Aspherical surface (fifth surface) K = −2.05781; A = 7.503334E-6 B = 1.53114E-7; C = 1.82387E-9; D = 4.51137E-12.

[0141] Condition parameter value _{f 1 / f T = 0.288,} (d 7 + d 8T) / f T = 0.0294, f 2 / f 1 = -1.039, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.109 FIG. 11 shows a lens configuration diagram of the zoom lens of the eleventh embodiment.

[0142] Example 12 f = 39.2~101.9, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.174 2.10 1 1.56732 42.84 2 32.444 1.57 3 -169.85 1.50 2 1.83500 42.98 4 16.136 4.99 3 1.58913 61.25 5-19.904 0.41 6 58.554 3.47 4 1.58313 59.467 7-19.144 0.508 (Aperture) Variable 9-5.647 2.87 5 1.70154 41.15 10-20.356 2.52 11-18.634 1.50 6 1.74330 49.22 12-465.225 3.59 13-16.855 1.807 7 1.51680 64.20 14-44. 083.

[0143] variable amount _{f 39.164 63.161 101.891 d 8 16.37 7.81} 2.50.

Aspherical surface (fifth surface) K = -0.25251, A = 7.80871E-6 B = -7.9646E-8, C = 2.08897E-9, D = -2.16979E-11.

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₇ + d _8T ) / f _T = 0.0294, f ₂ / f ₁ = −1.020, (r ₁₁ + r ₁₂ ) / (R ₁₁ −r ₁₂ ) = − 1.083 FIG. 12 shows a lens configuration diagram of the zoom lens of the twelfth embodiment.

[0146] Example 13 f = 39.1~101.7, F / No = 4.6~9.2, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 17.895 2.06 1 1.60342 38.01 2 36.725 2.06 3 -15.791 1.50 2 1.88300 40.80 4 21.788 5.00 3 1.58913 61.25 5-16.774 0.36 6 51.723 3.38 4 1.58913 61.25 7-21.733 0.508 (Aperture) Variable 9-59.436 2.865 1.70200 40.20 10-21.012 2.61 11-18.787 1.50 6 1.77250 49.62 12-789.791 3.62 13-17.054 1.80 7 1.48749 70.44 14-41. 127.

Variable f 39.133 63.112 101.742 d ₈ 16.51 7.86 2.50.

Aspherical surface (sixth surface) K = -1.855517, A = -5.32884E-6 B = 5.571716E-8, C = -6.57451E-10, D = 4.64733E-12.

[0149] Condition parameter value _{f 1 / f T = 0.289,} (d 7 + d 8T) / f T = 0.0295, f 2 / f 1 = -1.031, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.049 FIG. 13 shows a lens configuration diagram of the thirteenth embodiment.

[0150] Example 14 f = 39.2~102.0, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.779 2.11 1 1.56732 42.84 2 35.307 1.94 3 -16.278 1.50 2 1.83500 42.98 4 15.508 5.00 3 1.58913 61.25 5-18.152 0.35 6 54.081 3.42 4 1.58313 59.467 7-20.291 0.508 (Aperture) Variable 9-57.194 2.965 5 1.70154 41.15 10-19.941 2.28 11 -18.437 1.50 6 1.74330 49.22 12 -481.700 3.65 13 -16.573 1.80 7 1.51680 64.20 14 -44. 162.

[0151] variable amount _{f 39.164 63.198 102.013 d 8 16.40 7.82} 2.50.

Aspherical surface (sixth surface) K = 19.38562, A = -1.96417E-5 B = 1.66563E-7, C = -5.1288E-9, D = 4.99354E-11.

[0153] Condition parameter value _{f 1 / f T = 0.288,} (d 7 + d 8T) / f T = 0.0294, f 2 / f 1 = -1.022, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.080 FIG. 14 shows a lens configuration diagram of the fourteenth embodiment.

[0154] Example 15 f = 39.1~101.6, F / No = 4.6~9.2, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.157 2.04 1 1.60342 38.01 2 26.885 2.28 3 -16.390 1.50 2 1.88300 40.98 4 22.578 4.71 3 1.58913 61.25 5-200.297 0.10 6 40.826 3.58 4 1.58913 61.25 7-19.274 0.508 (Aperture) Variable 9-45.164 2.91 5 1.70200 40.20 10-19.117 2.55 11-17.700 1.50 6 1.77250 49.62 12 -162.689 3.62 13 -16.374 1.50 7 1.48749 70.44 14 -38. 481.

[0155] variable amount _{f 39.097 63.043 101.568 d 8 16.62 7.90} 2.50.

Aspherical surface (seventh surface) K = -1.37089, A = -3.306665E-6 B = -8.863343E-8, C = 2.87098E-9, D = -2.568850E-11 .

[0157] Condition parameter value _{f 1 / f T = 0.289,} (d 7 + d 8T) / f T = 0.0295, f 2 / f 1 = -1.039, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.244 FIG. 15 shows a lens configuration diagram of the zoom lens of the fifteenth embodiment.

[0158] Example 16 f = 39.1~101.9, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 15.751 2.11 1 1.56732 42.84 2 29.128 1.95 3 -17.232 1.50 2 1.83500 42.98 4 14.882 5.00 3 1.58913 61.25 5-21.840 0.30 6 44.347 3.59 4 1.58313 59.467 7-18.788 0.508 (Aperture) Variable 9-55.578 2.93 5 1.70154 41.15 10-20.010 2.37 11 -17.700 1.50 6 1.74330 49.22 12 -550.287 3.78 13 -16.182 1.80 7 1.51680 64.20 14 -40. 245.

[0159] variable amount _{f 39.140 63.159 101.907 d 8 16.38 7.81} 2.50.

Aspheric surface (seventh surface) K = -0.39371, A = 4.67462E-6 B = -1.22051E-7, C = 2.49511E-9, D = -2.99103E-11.

[0161] Condition parameter value _{f 1 / f T = 0.289,} (d 7 + d 8T) / f T = 0.0294, f 2 / f 1 = -1.020, (r 11 + r 12) / (R ₁₁ −r ₁₂ ) = − 1.070 FIG. 16 shows the lens configuration of the zoom lens of the sixteenth embodiment.

Embodiments 17 to 24 described below are examples in which aspheric surfaces are used for the image side surfaces of the third lens and the fifth lens in the basic structure of the zoom lens according to the first aspect.
r _i , d _i , n _j , and v _j are the same as those in FIG.

[0163] Example 17 f = 39.1~101.6, F / No = 4.6~9.2, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 17.434 1.93 1 1.62004 36.30 2 29.812 1.48 3 -16.482 1.50 2 1.88300 40.80 4 34.436 0.08 5 33.546 4.55 3 1.58913 61.25 6 -20.634 0.10 7 48.596 3.69 4 1.48749 70.44 8 -15.531 0.509 (Aperture) Variable 10 -44.818 3.32 5 1.78590 43.93 11 -20.513 2.96 12 -16.172 1.50 6 1.71300 53.94 13 -236.177 3.22 14 -19.693 1.50 7 1.48749 70.44 15- 49.421.

[0164] variable amount _{f 39.111 63.071 101.625 d 9 16.62 7.90} 2.50.

Aspherical surface (Sixth surface) K = −2.31778, A = 1.06903E-5, B = 6.26996E-8, C = 4.997440E-9, D = −2.49701E-11 Spherical surface (eleventh surface) K = 0.10626, A = -4.09542E-6, B = 7.25357E-8, C = -1.11384E-9, D = 4.30934E-12.

[0166] Condition parameter value _{f 1 / f T = 0.289,} (d 8 + d 9T) / f T = 0.0295, f 2 / f 1 = -1.039, (r 12 + r 13) / (R ₁₂ −r ₁₃ ) = − 1.147 FIG. 17 shows a lens configuration diagram of the zoom lens of the seventeenth embodiment.

[0167] Example 18 f = 39.1~101.6, F / No = 4.6~9.2, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.906 1.89 1 1.56732 42.84 2 35.108 2.03 3-16.417 1.50 2 1.83500 42.98 4 16.259 0.12 5 16.783 4.15 3 1.58913 61.25 6-18.991 0.10 7 66.604 4.72 4 1.58313 59.46 8-17.731 0.509 (Aperture) Variable 10-61.845 2.99 5 1.70154 41.15 11 -20.864 2.83 12 -15.682 1.50 6 1.74330 49.22 13 -929.844 3.28 14-21.191 1.80 7 1.51680 64.20 15 − 40.390.

Variable f 39.106 63.063 101.626 d ₉ 16.54 7.87 2.50.

Aspherical surface (sixth surface) K = -0.31061, A = 1.00985E-5, B = -2.665368E-7, C = 7.22642E-9, D = -6.36863E-11 Aspherical surface (eleventh surface) K = 0.29985, A = −6.08525E−6, B = 8.98227E−8, C = −1.07190E−9, D = 2.445612E−12.

[0170] The value of the conditional equation parameters _{f 1 / f T = 0.289,} (d 8 + d 9T) / f T = 0.02
_{95, f 2 / f 1 =} -1.033, (r 12 + r 13) / (r 12 -r
₁₃ ) =-1.034 FIG. 18 shows a lens configuration diagram of the zoom lens of the eighteenth embodiment.

[0171] Example 19 f = 39.2~101.9, F / No = 4.6~9.1, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 15.333 2.06 1 1.60342 38.01 2 24.597 2.02 3 -16.525 1.50 2 1.88300 40.80 4 22.717 0.10 5 19.380 4.14 3 1.58913 61.25 6-18.500 0.82 7 57.442 3.26 4 1.58913 61.25 8-20.570 0.509 (Aperture) Variable 10-48.111 2.86 5 1.70200 40.201 1 -19.835 2.70 12 -17.614 1.50 6 1.77250 49.62 13 -151.741 3.58 14 -16.179 1.50 7 1.48749 70.44 15- 42.012.

[0172] variable amount _{f 39.153 63.172 101.875 d 9 15.94 7.64} 2.50.

Aspherical surface (seventh surface) K = -22.07587, A = -2.05053E-5, B = -9.23154E-8, C = -4.30437E-9, D = 2.067797E- 11 Aspherical surface (eleventh surface) K = 0.05414, A = -1.07988E-6, B = -4.00107E-8, C = 1.80812E-10, D = -1.73956E-12.

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₈ + d _9T ) / f _T = 0.02
_{94, f 2 / f 1 =} -0.988, (r 12 + r 13) / (r 12 -r
₁₃ ) = − 1.263 FIG. 19 shows a lens configuration diagram of the zoom lens according to the nineteenth embodiment.

[0175] Example 20 f = 39.1~101.8, F / No = 4.6~9.1, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 15.695 2.14 1 1.56732 42.84 2 31.512 1.62 3-17.339 1.50 2 1.83500 42.98 4 15.750 0.10 5 15.429 3.94 3 1.58913 61.25 6-19.853 1.47 7 67.647 3.154 4 1.58313 59.46 -18.708 0.509 (Aperture) Variable 10-59.339 2.93 5 1.70154 41.15 11 -20.945 2.98 12 -15.666 1.50 6 1.74330 49.22 13 -278.538 3.00 14 -19.901 1.80 7 1.51680 64.20 15 − 44.145.

[0176] variable amount _{f 39.136 63.133 101.782 d 9 15.94 7.64} 2.50.

Aspherical surface (seventh surface) K = 10.3325, A = −2.63190E-5, B = 1.97929E-7, C = −8.641919E-9, D = 5.772528E-11 Spherical surface (eleventh surface) K = 0.27444, A = -4.97409E-6, B = 1.14880E-8, C = -6.77561E-10, D = 1.97041E-12.

Parameter Values of Conditional Expression f ₁ / f _T = 0.289, (d ₈ + d _9T ) / f _T = 0.02
_{95, f 2 / f 1 =} -0.989, (r 12 + r 13) / (r 12 -r
₁₃ ) = − 1.119 FIG. 20 shows a lens configuration diagram of the zoom lens of the twentieth embodiment.

[0179] Example 21 f = 39.1~101.7, F / No = 4.6~9.1, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 19.107 2.10 1 1.58144 40.89 2 50.837 1.74 3 -16.414 1.50 2 1.88300 40.80 4 22.454 0.10 5 19.663 5.00 3 1.58913 61.25 6-18.564 0.65 7 66.295 3.24 4 1.58313 59.468 8-21.374 0.509 (Aperture) Variable 10-109.479 3.21 5 1.70154 41.15 11 -22.334 2.78 12 -14.298 1.50 6 1.74330 49.22 13 380.430 3.33 14-20.773 1.50 7 1.51680 64 .20 15 − 31.327.

[0180] variable amount _{f 39.129 63.089 101.690 d 9 16.35 7.80} 2.50.

Aspherical surface (eighth surface) K = -1.664377, A = 1.52879E-6, B = -6.91771E-8, C = 5.44751E-9, D = -3.38869E-11 Aspherical surface (eleventh surface) K = 0.58382, A = -1.36765E-5, B = 1.40541E-8, C = -1.31303E-9, D = 4.95622E-12.

The value of the parameter of the conditional expression f ₁ / f _T = 0.289, (d ₈ + d _9T ) / f _T = 0.02
_{95, f 2 / f 1 =} -1.019, (r 12 + r 13) / (r 12 -r
₁₃ ) =-0.928 FIG. 21 shows a lens configuration diagram of the zoom lens of the twenty-first embodiment.

[0183] Example 22 f = 39.2~102.0, F / No = 4.6~9.1, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 17.492 2.12 1 1.56732 42.84 2 41.791 1.53 3-15.702 1.50 2 1.83500 42.98 4 17.199 0.10 5 15.851 4.57 3 1.58913 61.25 6-16.093 0.73 7 67.454 3.694 1.58313 59.468 8-23.919 0.509 (Aperture) Variable 10-66.431 3.02 5 1.70154 41.15 11 -21.513 3.04 12 -14.600 1.506 61.734330 49.22 13 -412.592 2.74 14-22.662 1.807 7 1.48749 70.44 15- 43.322.

[0184] variable amount _{f 39.157 63.199 101.993 d 9 16.12 7.71} 2.50.

Aspherical surface (eighth surface) K = −0.74890, A = 1.0234E-5, B = 1.008585E-8, C = 1.88892E-9, D = 7.666249E-11 Aspherical surface (Eleventh surface) K = 0.46689, A = -8.0797E-6, B = -2.81752E-8, C = -3.1182E-10, D = -9.78419E-13.

[0186] The value of the conditional equation parameters _{f 1 / f T = 0.288,} (d 8 + d 9T) / f T = 0.02
_{94, f 2 / f 1 =} -1.002, (r 12 + r 13) / (r 12 -r
₁₃ ) =-1.073 FIG. 22 shows a lens configuration diagram of the zoom lens of Example 22.

[0187] Example 23 f = 39.2~102.0, F / No = 4.6~9.1, ω = 28.2~11.9 ( _{degrees) i r i d i j n} j ν j 1 17.871 1.94 1 1.58144 40.89 2 46.710 2.12 3 -16.292 1.50 2 1.88300 40.80 4 20.761 0.10 5 19.169 3.82 3 1.58913 61.25 6-21.502 0.46 7 64.521 3.46 4 1.58313 59.46 8-17.070 0.509 (Aperture) Variable 10-182.110 3.40 5 1.70154 41.15 11 -20.394 1.56 12 -17.163 1.50 6 1.74330 49.22 13 845.824 4.20 14 -16.032 1.80 7 1.51680 64 .20 15 − 62.870.

[0188] variable amount _{f 39.161 63.195 102.027 d 9 15.51 7.48} 2.50.

Aspherical surface (eighth surface) K = −1.32790, A = −3.19583E−6, B = −6.880721E−8, C = 4.78853E−9, D = −5.40771E− 11 Aspherical surface (tenth surface) K = -138.07521, A = 1.33881E-5, B = 2.411135E-7, C = -1.01457E-9, D = -5.44651E-11 Aspherical surface (Eleventh surface) K = -0.28544, A = 3.90236E-6, B = 1.78823E-7, C = 8.07859E-10, D = -6.49043E-11.

[0190] The value of the conditional equation parameters _{f 1 / f T = 0.288,} (d 8 + d 9T) / f T = 0.02
_{94, f 2 / f 1 =} -0.957, (r 12 + r 13) / (r 12 -r
₁₃ ) = − 0.960 FIG. 23 shows a lens configuration diagram of the zoom lens according to Example 23.

[0191] Example 24 f = 39.1~101.8, F / No = 4.6~9.2, ω = 28.5~12.0 ( _{degrees) i r i d i j n} j ν j 1 17.467 2.24 1 1.56732 42.84 2 58.122 1.27 3-17.648 1.50 2 1.83500 42.98 4 15.043 0.10 5 14.122 4.08 3 1.58913 61.25 6-19.856 1.62 7 100.200 2.94 4 1.58313 59.468 8-19.697 0.509 (Aperture) Variable 10-110.330 3.12 5 1.70200 40.20 11 -23.730 2.92 12 -13.632 1.50 6 1.74330 49.22 13 -342.932 2.43 14 -25.042 1.80 7 1.48749 70.44 15-49.937.

[0192] variable amount _{f 39.132 63.104 101.772 d 9 15.64 7.53} 2.50.

Aspherical surface (eighth surface) K = -0.68447, A = 8.482262E-6, B = 1.45104E-8, C = 1.88716E-9, D = 8.30577E-11 Aspherical surface (Tenth surface) K = -80.53784, A = 1.51047E-5, B = 2.262599E-7, C = -1.88068E-9, D = 2.59696E-12 Aspheric surface (Eleventh surface) ) K = -0.06054, A = -1.61761E-6, B = 7.18922E-8, C = -1.01346E-9, D = -7.819225E-12.

[0194] The value of the conditional equation parameters _{f 1 / f T = 0.289,} (d 8 + d 9T) / f T = 0.02
_{95, f 2 / f 1 =} -0.966, (r 12 + r 13) / (r 12 -r
₁₃ ) =-1.083 FIG. 24 shows a lens configuration diagram of the zoom lens of Example 24.

Embodiments 25 to 32 described below are examples in which aspheric surfaces are used for the image side surfaces of the third lens and the fifth lens in the basic structure of the zoom lens according to the sixteenth aspect. r _i , d _i , n _j , and v _j are the same as in FIG.

[0196] Example 25 f = 39.1~101.8, F / No = 4.6~9.0, ω = 28.3~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.996 1.85 1 1.62004 36.30 2 32.610 1.75 3 -18.461 1.50 2 1.88300 40.80 4 24.818 4.20 3 1.58913 61.25 5-22.203 0.92 6 53.254 3.78 4 1.48749 70.44 7 -15.164 0.508 (Aperture) Variable 9-70.883 3.035 5 1.78590 43.93 10 -20.945 2.29 11 -15.738 1.50 6 1.71300 53.94 12 756.482 3.76 13 -18.130 1.80 7 1.48749 70.44 14 -50.799 .

[0197] variable amount _{f 39.134 63.089 101.783 d 8 15.89 7.63} 2.50.

Aspherical surface (fifth surface) K = −2.54784, A = 1.53201E-5, B = 6.922263E-8, C = 6.35961E-9, D = −4.002990E-11 Spherical surface (tenth surface) K = 0.27493, A = −5.2876E−6, B = 1.82076E−8, C = −8.14736E−10, D = 3.228204E−12.

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₇ + d _8T ) / f _T = 0.02
_{95, f 2 / f 1 =} -0.985, (r 11 + r 12) / (r 11 -r
₁₂ ) = − 0.959 FIG. 25 shows a lens configuration diagram of the zoom lens of the twenty-fifth embodiment.

[0200] Example 26 f = 39.1~101.8, F / No = 4.6~8.9, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 14.953 2.17 1 1.56732 42.84 2 29.138 1.82 3-17.728 1.50 2 1.83500 42.98 4 14.462 4.18 3 1.58913 61.25 5-21.904 0.70 6 57.954 3.50 4 1.58313 59.467 7-17.410 0.508 (Aperture) Variable 9-83.199 3.365 1.70154 41.15 10-19.983 2.46 11 -13.845 1.50 6 1.74330 49.22 12-426.128 2.94 13-21.051 1.80 7 1.51680 64.20 14-42. 895.

[0201] variable amount _{f 39.135 63.140 101.834 d 8 15.99 7.66} 2.50.

Aspherical surface (fifth surface) K = −0.45927, A = 1.156156E-5, B = −6.42690E-8, C = 2.95151E-9, D = −1.90111E-11 Aspherical surface (tenth surface) K = 0.52940, A = -9.19464E-6, B = -4.021511E-8, C = -7.62756E-10, D = 2.373550E-12.

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₇ + d _8T ) / f _T = 0.02
_{95, f 2 / f 1 =} -0.992, (r 11 + r 12) / (r 11 -r
₁₂ ) =-1.067 FIG. 26 shows a lens configuration diagram of the zoom lens of the twenty-sixth embodiment.

[0204] Example 27 f = 39.1~101.9, F / No = 4.6~9.0, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 13.481 2.05 1 1.60342 38.01 2 20.084 1.97 3 -16.014 1.50 2 1.88300 40.80 4 21.455 3.86 3 1.58913 61.25 5-18.712 0.10 6 46.331 3.73 4 1.58913 61.25 7-18.139 0.508 (Aperture) Variable 9-93.424 3.415 5.70200 40.20 10-19.861 2.30 11 -14.289 1.50 6 1.77250 49.62 12 -392.408 3.18 13 -19.337 1.807 7 1.48749 70.44 14 -40. 376.

Variable f 39.130 63.136 101.915 d ₈ 16.11 7.71 2.50.

Aspherical surface (Sixth surface) K = −8.1342, A = −1.53469E−5, B = −5.1555E−8, C = −3.744477E−10, D = −3.24038E −12 Aspherical surface (tenth surface) K = 0.40866, A = −7.112913E−6, B = −1.57131E−7, C = 1.36470E−9, D = −9.3870E−12.

[0207] Condition parameter value _{f 1 / f T = 0.288,} (d 7 + d 8T) / f T = 0.02
_{94, f 2 / f 1 =} -1.001, (r 11 + r 12) / (r 11 -r
₁₂ ) = − 1.076 FIG. 27 shows a lens configuration diagram of the zoom lens of the twenty-seventh embodiment.

[0208] Example 28 f = 39.1~101.8, F / No = 4.6~8.9, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 13.612 2.18 1 1.56732 42.84 2 23.137 1.983 -17.968 1.50 2 1.83500 42.98 4 13.650 4.75 3 1.58913 61.25 5-22.258 0.21 6 43.816 3.50 4 1.58313 59.467 7-18.685 0.508 (Aperture) Variable 9-82.390 3.40 5 1.70154 41.15 10-19.288 2.28 11 -14.044 1.50 6 1.74330 49.22 12 -353.570 3.15 13 -19.282 1.807 7 1.51680 64.20 14 -42. 958.

[0209] variable amount _{f 39.137 63.158 101.838 d 8 15.92 7.63} 2.50.

Aspherical surface (Sixth surface) K = 11.23828, A = -2.90313E-5, B = -2.38701E-8, C = -6.589938E-10, D = 1.01875E-12 Aspheric surface (tenth surface) K = 0.39653, A = -6.06292E-6, B = -1.3334E-7, C = 9.64736E-10, D = -6.83045E-12.

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₇ + d _8T ) / f _T = 0.02
_{95, f 2 / f 1 =} -0.987, (r 11 + r 12) / (r 11 -r
₁₂ ) =-1.083 FIG. 28 shows a lens configuration diagram of the zoom lens according to the twenty-eighth embodiment.

[0212] Example 29 f = 39.1~101.7, F / No = 4.6~8.9, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 16.267 2.16 1 1.58144 40.89 2 36.470 1.78 3 -17.389 1.50 2 1.88300 40.80 4 20.571 4.84 3 1.58913 61.25 5-20.112 0.68 6 57.801 3.37 4 1.58313 59.467-19.086 0.508 (Aperture) Variable 9 -92.285 3.40 5 1.70154 41.15 10-19.919 2.35 11 -14.060 1.50 6 1.74330 49.22 12 -706.221 3.14 13 -19.981 1.807 7 1.51680 64.20 14 -42. 252.

[0213] variable amount _{f 39.125 63.107 101.720 d 8 15.94 7.64} 2.50.

Aspherical surface (seventh surface) K = −1.1658, A = −4.73081E−6, B = −1.08732E−7, C = 4.4167E−9, D = −4.3359E− 11 Aspherical surface (tenth surface) K = 0.39514, A = -9.82100E-6, B = -5.42638E-8, C = -9.149917E-10, D = 4.48008E-12.

[0215] Condition parameter value _{f 1 / f T = 0.289,} (d 7 + d 8T) / f T = 0.02
_{95, f 2 / f 1 =} -0.989, (r 11 + r 12) / (r 11 -r
₁₂ ) =-1.041 FIG. 29 shows a lens configuration diagram of the zoom lens of the embodiment 29.

[0216] Example 30 f = 39.1~101.9, F / No = 4.6~8.9, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 15.368 2.16 1 1.56732 42.84 2 30.650 1.94 3 -16.770 1.50 2 1.83500 42.98 4 14.901 4.19 3 1.58913 61.25 5 -20.709 0.57 6 53.096 3.50 4 1.58313 59.467-17.851 0.508 (Aperture) Variable 9 -103.576 3.41 5 1.70154 41.15 10-20.377 2.4011-13.836 1.50 6 1.74330 49.22 12-3240.648 3.0613-20.932 1.80 7 1.48749 70.44 14-43. 398.

[0217] variable amount _{f 39.121 63.122 101.889 d 8 15.98 7.66} 2.50.

Aspherical surface (seventh surface) K = -0.23581, A = 6.509087E-6, B = -1.33076E-7, C = 3.42072E-9, D = -3.50817E-11 Aspheric surface (tenth surface) K = 0.60073, A = −1.02256E−5, B = −4.99667E−8, C = −7.41601E−10, D = 2.58173E−12.

[0219] Condition parameter value _{f 1 / f T = 0.289,} (d 7 + d 8T) / f T = 0.02
_{94, f 2 / f 1 =} -0.991, (r 11 + r 12) / (r 11 -r
₁₂ ) =-1.009 FIG. 30 shows a lens configuration diagram of the zoom lens according to Example 30.

[0220] Example 31 f = 39.2~102.0, F / No = 4.6~8.9, ω = 28.4~11.9 ( _{degrees) i r i d i j n} j ν j 1 16.525 2.09 1 1.58144 40.89 2 33.908 1.83 3 -15.646 1.50 2 1.88300 40.80 4 20.854 3.19 3 1.58913 61.25 5-19.888 0.70 6 57.010 3.53 4 1.58313 59.467 7-16.737 0.508 (Aperture) Variable 9 -195.265 3.48 5 1.70154 41.15 10-20.371 1.58 11-16.226 1.50 6 1.74330 49.22 12 639.303 3.9813-15.753 1.807 7 1.51680 64.20 14-44.861 .

[0221] variable amount _{f 39.166 63.209 101.964 d 8 15.68 7.54} 2.50.

Aspherical surface (seventh surface) K = −1.22940, A = −5.48964E−6, B = −1.09334E−7, C = 3.4401E−9, D = −4.726263E− 11 Aspherical surface (ninth surface) K = -321.36790, A = 1.50555E-5, B = 2.07266E-7, C = -8.23575E-10, D = -2.01648E-11 Aspherical surface (Tenth surface) K = −0.29321, A = 4.36102E-6, B = 8.76323E-8, C = 5.04052E-10, D = −2.951139E-11.

Values of parameters of conditional expression f ₁ / f _T = 0.288, (d ₇ + d _8T ) / f _T = 0.02
_{94, f 2 / f 1 =} -0.969, (r 11 + r 12) / (r 11 -r
₁₂ ) = − 0.950 FIG. 31 shows a lens configuration diagram of the zoom lens of Example 31.

[0224] Example 32 f = 39.1~101.9, F / No = 4.6~8.9, ω = 28.4~12.0 ( _{degrees) i r i d i j n} j ν j 1 15.487 2.18 1 1.56732 42.84 2 34.102 1.43 3 -17955 1.50 2 1.83500 42.98 4 15.669 3.58 3 1.58913 61.25 5-21.711 1.45 6 59.650 3.37 4 1.58313 59.467-18.281 0.508 (Aperture) Variable 9 -129.200 3.33 5 1.70200 40.20 10 -22.505 2.64 11 -13.068 1.50 6 1.74330 49.22 12 -430.928 2.50 13 -24.780 1.80 7 1.48749 70.44 14 -48. 116.

[0225] variable amount _{f 39.144 63.142 101.899 d 8 15.69 7.55} 2.50.

Aspherical surface (seventh surface) K = −0.43880, A = 4.76022E-6, B = −1.64739E-7, C = 4.38222E-9, D = −5.48323E-11 Aspherical surface (ninth surface) K = -62.653554, A = 1.52319E-5, B = 1.76511E-7, C = -1.40022E-9, D = 1.425275E-11 Aspherical surface (ninth surface) K = 0.27526, A = -5.56274E-6, B = 7.550615E-8, C = -2.48742E-9, D = 1.65569E-11.

Values of parameters of conditional expression f ₁ / f _T = 0.289, (d ₇ + d _8T ) / f _T = 0.0294, f ₂ / f ₁ = −0.970, (r ₁₁ + r ₁₂ ) / (R ₁₁ −r ₁₂ ) = − 1.063 FIG. 32 shows a lens configuration diagram of the zoom lens of the embodiment 32.

FIGS. 33 to 35 show aberration diagrams relating to the first embodiment. 33 is a short focal length end, FIG. 34 is an intermediate focal length, FIG.
Reference numeral 5 relates to the long focal end.

FIGS. 36 to 38 show aberration diagrams relating to the second embodiment. 36 is the short focal length end, FIG. 37 is the intermediate focal length, FIG.
Reference numeral 8 relates to the long focal end.

FIGS. 39 to 41 show aberration diagrams relating to the third embodiment. 39 is the short focal length end, FIG. 40 is the intermediate focal length, FIG.
Reference numeral 1 relates to the long focal end.

FIGS. 42 to 44 show aberration diagrams relating to the fourth embodiment. 42 is the short focal length end, FIG. 43 is the intermediate focal length, FIG.
Reference numeral 4 relates to the long focal end.

FIGS. 45 to 47 show aberration diagrams relating to the fifth embodiment. 45 is the short focal length end, FIG. 46 is the intermediate focal length, FIG.
Reference numeral 7 relates to the long focal end.

FIGS. 48 to 50 show aberration diagrams relating to the sixth embodiment. 48 is the short focal length end, FIG. 49 is the intermediate focal length, FIG.
0 relates to the long focal end.

FIGS. 51 to 53 show aberration diagrams relating to the seventh embodiment. 51 is the short focal length end, FIG. 52 is the intermediate focal length, FIG.
Reference numeral 3 relates to the long focal end.

54 to 56 show aberration diagrams relating to the eighth embodiment. 54 is the short focal length end, FIG. 55 is the intermediate focal length, FIG.
Reference numeral 6 relates to the long focal end.

FIGS. 57 to 59 show aberration diagrams relating to the ninth embodiment. FIG. 57 shows the short focal length end, FIG. 58 shows the intermediate focal length, and FIG.
Reference numeral 9 relates to the long focal end.

FIGS. 60 to 62 show aberration diagrams relating to the tenth embodiment. 60 relates to the short focal length end, FIG. 61 relates to the intermediate focal length, and FIG. 62 relates to the long focal length end.

FIGS. 63 to 65 show aberration diagrams relating to the eleventh embodiment. 63 relates to the short focal length end, FIG. 64 relates to the intermediate focal length, and FIG. 65 relates to the long focal length end.

FIGS. 66 to 68 show aberration diagrams relating to the twelfth embodiment. 66 relates to the short focal length end, FIG. 67 relates to the intermediate focal length, and FIG. 68 relates to the long focal length end.

FIGS. 69 to 71 show aberration diagrams relating to the thirteenth embodiment. 69 relates to the short focal length end, FIG. 70 relates to the intermediate focal length, and FIG. 71 relates to the long focal length end.

FIGS. 72 to 74 show aberration diagrams relating to the fourteenth embodiment. 72 relates to the short focal length end, FIG. 73 relates to the intermediate focal length, and FIG. 74 relates to the long focal length end.

FIGS. 75 to 77 show aberration diagrams relating to the fifteenth embodiment. 75 relates to the short focal length, FIG. 76 relates to the intermediate focal length, and FIG. 77 relates to the long focal length.

FIGS. 78 to 80 show aberration diagrams relating to the sixteenth embodiment. 78 relates to the short focal length end, FIG. 79 relates to the intermediate focal length, and FIG. 80 relates to the long focal length end.

FIGS. 81 to 83 show aberration diagrams relating to the seventeenth embodiment. 81 relates to the short focal length end, FIG. 82 relates to the intermediate focal length, and FIG. 83 relates to the long focal length end.

FIGS. 84 to 86 show aberration diagrams relating to the eighteenth embodiment. 84 relates to the short focal length end, FIG. 85 relates to the intermediate focal length, and FIG. 86 relates to the long focal length end.

FIGS. 87 to 89 show aberration diagrams relating to the nineteenth embodiment. 87 relates to the short focal length end, FIG. 88 relates to the intermediate focal length, and FIG. 89 relates to the long focal length end.

FIGS. 90 to 92 show aberration diagrams relating to the twentieth embodiment. 90 relates to the short focal length, FIG. 91 relates to the intermediate focal length, and FIG. 92 relates to the long focal length.

FIGS. 93 to 95 show aberration diagrams relating to the twenty-first embodiment. 93 relates to the short focal length end, FIG. 94 relates to the intermediate focal length, and FIG. 95 relates to the long focal length end.

FIGS. 96 to 98 show aberration diagrams relating to the twenty-second embodiment. 96 relates to the short focal length, FIG. 97 relates to the intermediate focal length, and FIG. 98 relates to the long focal length.

FIGS. 99 to 101 show aberration diagrams relating to the twenty-third embodiment. 99 relates to the short focal length end, FIG. 100 relates to the intermediate focal length, and FIG. 101 relates to the long focal length end.

FIGS. 102 to 104 show aberration diagrams relating to the twenty-fourth embodiment. 102 relates to the short focal length, FIG. 103 relates to the intermediate focal length, and FIG. 104 relates to the long focal length.

FIGS. 105 to 107 show aberration diagrams relating to the twenty-fifth embodiment. FIG. 105 relates to the short focal length, FIG. 106 relates to the intermediate focal length, and FIG. 107 relates to the long focal length.

FIGS. 108 to 110 are aberration diagrams for the twenty-sixth embodiment. 108 relates to the short focal length, FIG. 109 relates to the intermediate focal length, and FIG. 110 relates to the long focal length.

FIGS. 111 to 113 show aberration diagrams relating to the twenty-seventh embodiment. 111 relates to the short focal length, FIG. 112 relates to the intermediate focal length, and FIG. 113 relates to the long focal length.

FIGS. 114 to 116 are aberration diagrams for the twenty-eighth embodiment. 114 relates to the short focal length, FIG. 115 relates to the intermediate focal length, and FIG. 116 relates to the long focal length.

FIGS. 117 to 119 show aberration diagrams relating to the twenty-ninth embodiment. FIG. 117 relates to the short focal length end, FIG. 118 relates to the intermediate focal length, and FIG. 119 relates to the long focal length end.

FIGS. 120 to 122 show aberration diagrams relating to the thirtieth embodiment. 120 relates to the short focal length, FIG. 121 relates to the intermediate focal length, and FIG. 122 relates to the long focal length.

FIGS. 123 to 125 show aberration diagrams relating to the thirty-first embodiment. 123 relates to the short focal length, FIG. 124 relates to the intermediate focal length, and FIG. 125 relates to the long focal length.

FIGS. 126 to 128 show aberration diagrams relating to the thirty-second embodiment. 126 relates to the short focal length end, FIG. 127 relates to the intermediate focal length, and FIG. 128 relates to the long focal length end.

In the figures of the spherical aberration, d and g denote the spherical aberration of the d-line and the g-line (dashed line is a sine condition), the solid line in the astigmatism diagram denotes the sagittal image plane, and the broken line denotes the meridional image plane.

In each of the embodiments, aberration is well corrected at any of the short focal length end, the intermediate focal length, and the long focal length end, and the performance is excellent.

[0262]

As described above, according to the present invention, a novel zoom lens can be provided. Since the zoom lens according to the present invention has the above-described configuration, it has a wide angle of view of about 30 degrees and a large size of 2.5 or more, despite the simple configuration of the seven-element zoom of the second group. The zoom ratio can be realized and it is extremely compact. In the zoom lens according to the fourth to sixteenth aspects, by adopting an aspherical surface, it is possible to further shorten the overall length and promote compactness while maintaining good performance.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a lens configuration of a zoom lens according to a first embodiment.

FIG. 2 is a diagram illustrating a lens configuration of a zoom lens according to a second embodiment.

FIG. 3 is a diagram illustrating a lens configuration of a zoom lens according to a third embodiment.

FIG. 4 is a diagram illustrating a lens configuration of a zoom lens according to a fourth embodiment.

FIG. 5 is a diagram illustrating a lens configuration of a zoom lens according to a fifth embodiment.

FIG. 6 is a diagram illustrating a lens configuration of a zoom lens according to a sixth embodiment.

FIG. 7 is a diagram illustrating a lens configuration of a zoom lens according to a seventh embodiment.

FIG. 8 is a diagram illustrating a lens configuration of a zoom lens according to an eighth embodiment.

FIG. 9 is a diagram illustrating a lens configuration of a zoom lens according to a ninth embodiment.

FIG. 10 is a diagram illustrating a lens configuration of a zoom lens according to a tenth embodiment.

FIG. 11 is a diagram illustrating a lens configuration of a zoom lens according to an eleventh embodiment.

FIG. 12 is a diagram illustrating a lens configuration of a zoom lens according to a twelfth embodiment.

FIG. 13 is a diagram illustrating a lens configuration of a zoom lens according to a thirteenth embodiment.

FIG. 14 is a diagram illustrating a lens configuration of a zoom lens according to a fourteenth embodiment.

FIG. 15 is a diagram illustrating a lens configuration of a zoom lens according to a fifteenth embodiment.

FIG. 16 is a diagram illustrating a lens configuration of a zoom lens according to a sixteenth embodiment.

FIG. 17 is a diagram illustrating a lens configuration of a zoom lens according to a seventeenth embodiment.

FIG. 18 is a diagram illustrating a lens configuration of a zoom lens according to an eighteenth embodiment.

FIG. 19 is a diagram illustrating a lens configuration of a zoom lens according to a nineteenth embodiment.

FIG. 20 is a diagram illustrating a lens configuration of a zoom lens according to a twentieth embodiment.

FIG. 21 is a diagram illustrating a lens configuration of a zoom lens according to a twenty-first embodiment.

FIG. 22 is a diagram illustrating a lens configuration of a zoom lens according to Example 22;

FIG. 23 is a diagram illustrating a lens configuration of a zoom lens according to Example 23;

24 is a diagram illustrating a lens configuration of a zoom lens according to Example 24. FIG.

FIG. 25 is a diagram illustrating a lens configuration of a zoom lens according to Example 25;

FIG. 26 is a diagram illustrating a lens configuration of a zoom lens according to a twenty-sixth embodiment.

FIG. 27 is a diagram illustrating a lens configuration of a zoom lens according to Example 27;

FIG. 28 is a diagram illustrating a lens configuration of a zoom lens according to Example 28;

FIG. 29 is a diagram illustrating a lens configuration of a zoom lens according to Example 29;

FIG. 30 is a diagram illustrating a lens configuration of a zoom lens according to Example 30;

FIG. 31 is a diagram illustrating a lens configuration of a zoom lens according to Example 31;

32 is a diagram illustrating a lens configuration of a zoom lens according to Example 32. FIG.

FIG. 33 is an aberration diagram at a short focal length end of the zoom lens in Example 1;

FIG. 34 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 1;

FIG. 35 is an aberration diagram at a long focal end of the zoom lens in Example 1;

FIG. 36 is an aberration diagram at a short focal length end of the zoom lens in Example 2;

FIG. 37 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 2;

FIG. 38 is an aberration diagram at a long focal end of the zoom lens according to Example 2;

FIG. 39 is an aberration diagram at a short focal length end of the zoom lens in Example 3;

FIG. 40 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 3;

FIG. 41 is an aberration diagram at a long focal end of the zoom lens according to Example 3;

FIG. 42 is an aberration diagram at a short focal length end of the zoom lens according to Example 4;

FIG. 43 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 4;

FIG. 44 is an aberration diagram at a long focal end of the zoom lens according to Example 4;

FIG. 45 is an aberration diagram at a short focal length end of the zoom lens in Example 5;

FIG. 46 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 5;

FIG. 47 is an aberration diagram at a long focal end of the zoom lens in Example 5;

FIG. 48 is an aberration diagram at a short focal length end of the zoom lens according to Example 6;

FIG. 49 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 6;

FIG. 50 is an aberration diagram at a long focal end of the zoom lens according to Example 6;

FIG. 51 is an aberration diagram at a short focal length end of the zoom lens in Example 7;

FIG. 52 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 7;

FIG. 53 is an aberration diagram at a long focal end of the zoom lens according to Example 7;

FIG. 54 is an aberration diagram at a short focal length end of the zoom lens according to Example 8;

FIG. 55 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 8;

FIG. 56 is an aberration diagram at a long focal end of the zoom lens in Example 8;

FIG. 57 is an aberration diagram at a short focal length end of the zoom lens in Example 9;

FIG. 58 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 9;

FIG. 59 is an aberration diagram at a long focal end of the zoom lens in Example 9;

FIG. 60 is an aberration diagram at a short focal length end of the zoom lens according to Example 10;

FIG. 61 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 10;

FIG. 62 is an aberration diagram at a long focal end of the zoom lens according to Example 10;

FIG. 63 is an aberration diagram at a short focal length end of the zoom lens in Example 11;

FIG. 64 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 11;

FIG. 65 is an aberration diagram at a long focal end of the zoom lens according to Example 11;

FIG. 66 is an aberration diagram at a short focal length end of the zoom lens according to Example 12;

FIG. 67 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 12;

FIG. 68 is an aberration diagram at a long focal end of the zoom lens according to Example 12;

FIG. 69 is an aberration diagram at a short focal length end of the zoom lens according to Example 13;

FIG. 70 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 13;

FIG. 71 is an aberration diagram at a long focal end of the zoom lens according to Example 13;

FIG. 72 is an aberration diagram at a short focal length end of the zoom lens according to Example 14;

FIG. 73 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 14;

74 is an aberration diagram at a long focal end of the zoom lens according to Example 14; FIG.

FIG. 75 is an aberration diagram at a short focal length end of the zoom lens in Example 15;

FIG. 76 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 15;

FIG. 77 is an aberration diagram at a long focal end of the zoom lens in Example 15;

FIG. 78 is an aberration diagram at a short focal length end of the zoom lens according to Example 16;

FIG. 79 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 16;

FIG. 80 is an aberration diagram at a long focal end of the zoom lens in Example 16;

FIG. 81 is an aberration diagram at a short focal length end of the zoom lens in Example 17;

FIG. 82 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 17;

FIG. 83 is an aberration diagram at a long focal end of the zoom lens according to Example 17;

FIG. 84 is an aberration diagram at a short focal length end of the zoom lens according to Example 18;

FIG. 85 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 18;

86 is an aberration diagram at a long focal end of the zoom lens according to Example 18; FIG.

FIG. 87 is an aberration diagram at a short focal length end of the zoom lens in Example 19;

FIG. 88 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 19;

FIG. 89 is an aberration diagram at a long focal end of the zoom lens in Example 19;

FIG. 90 is an aberration diagram at a short focal length end of the zoom lens according to Example 20;

FIG. 91 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 20;

FIG. 92 is an aberration diagram at a long focal end of the zoom lens according to Example 20;

FIG. 93 is an aberration diagram at a short focal length end of the zoom lens according to Example 21;

FIG. 94 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 21;

FIG. 95 is an aberration diagram at a long focal end of the zoom lens according to Example 21;

FIG. 96 is an aberration diagram at a short focal length end of the zoom lens according to Example 22;

FIG. 97 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 22;

FIG. 98 is an aberration diagram at a long focal end of the zoom lens according to Example 22;

FIG. 99 is an aberration diagram at a short focal length end of the zoom lens according to Example 23;

FIG. 100 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 23;

FIG. 101 is an aberration diagram at a long focal end of the zoom lens according to Example 23;

FIG. 102 is an aberration diagram at a short focal length end of the zoom lens according to Example 24;

FIG. 103 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 24;

104 is an aberration diagram at a long focal end of the zoom lens according to Example 24. FIG.

FIG. 105 is an aberration diagram at a short focal length end of the zoom lens in Example 25;

106 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 25. FIG.

107 is an aberration diagram at a long focal end of the zoom lens according to Example 25. FIG.

108 is an aberration diagram at a short focal length end of the zoom lens according to Example 26; FIG.

FIG. 109 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 26;

110 is an aberration diagram at a long focal end of the zoom lens according to Example 26. FIG.

FIG. 111 is an aberration diagram at a short focal length end of the zoom lens according to Example 27;

112 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 27. FIG.

113 is an aberration diagram at a long focal end of the zoom lens according to Example 27. FIG.

114 is an aberration diagram at a short focal length end of the zoom lens according to Example 28. FIG.

FIG. 115 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 28;

116 is an aberration diagram at a long focal end of the zoom lens according to Example 28. FIG.

FIG. 117 is an aberration diagram at a short focal length end of the zoom lens in Example 29;

FIG. 118 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 29;

FIG. 119 is an aberration diagram at a long focal end of the zoom lens in Example 29;

120 is an aberration diagram at a short focal length end of the zoom lens according to Example 30. FIG.

121 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 30. FIG.

122 is an aberration diagram at a long focal end of the zoom lens according to Example 30. FIG.

123 is an aberration diagram at a short focal length end of the zoom lens according to Example 31. FIG.

124 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 31. FIG.

125 is an aberration diagram at a long focal end of the zoom lens according to Example 31. FIG.

126 is an aberration diagram at a short focal length end of the zoom lens according to Example 32. FIG.

127 is an aberration diagram at an intermediate focal length of the zoom lens according to Example 32. FIG.

FIG. 128 is an aberration diagram at a long focal end of the zoom lens according to Example 32;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st lens 2 2nd lens 3 3rd lens 4 4th lens 5 5th lens 6 6th lens 7 7th lens

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04

Claims (16)

(57) [Claims] A first lens unit having a positive focal length is disposed on the object side, and a second lens unit having a negative focal length is disposed on the image side. The distance between the first and second lens units is changed. In the zoom lens that performs magnification, the first group includes, in order from the object side, a first lens that is a positive meniscus lens having a convex surface facing the object side, a second lens that is a biconcave lens, a third lens that is a biconvex lens, A second lens group includes a fifth lens that is a positive meniscus lens having a convex surface facing the image side, a sixth lens that is a negative lens, and a convex surface that faces the image. A seventh lens, which is a negative meniscus lens directed toward the zoom lens, has a focal length of the whole system at the long focal length end: f _T , a focal length of the first group: f ₁ , a focal length of the second group: f ₂ , The distance between the first and second lens groups at the long focal end: d ₈ + d _9T is the condition (1) 0.2 7 _{<satisfied f 1 / f T <0.31 (} 2) (d 8 + d 9T) / f T <0.035 (3) -1.1 <f 2 / f 1 <-0.9, 2 zoom lens, characterized in that the chromatic .5 times the zoom ratio. 2. The zoom lens according to claim 1, wherein the radius of curvature of the object side surface and the image side surface of the sixth lens is r _12.
And _{r 13} is the condition _{(4) -1.4 <(r 12} + r 13) / (r 12 -r 13) <- zoom lens satisfies the 0.9. 3. The zoom lens according to claim 1, wherein the refractive index of the material of the second lens is n ₂ , the Abbe number of the material of the fourth lens is ν ₄ , and the Abbe number of the material of the seventh lens is ν.
₇ satisfies the following condition: (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0. 4. The zoom lens according to claim 1, wherein the third lens has an aspheric image side surface. 5. The zoom lens according to claim 4, wherein the radius of curvature of the object side surface and the image side surface of the sixth lens is r _12.
And _{r 13} is the condition _{(4) -1.4 <(r 12} + r 13) / (r 12 -r 13) <- zoom lens satisfies the 0.9. 6. The zoom lens according to claim 4, wherein the X-axis is taken with the direction toward the image side as the origin with respect to the intersection of the third lens with the optical axis on the image side, and the height in the direction orthogonal to the optical axis. S: Take H and calculate the reciprocal of the radius of curvature on the optical axis as C ₆ (= 1 /
r ₆ ), the image side surface: X ₆ (H) and C
_6, condition _{(8) X 6 (H)} > C 6 H 2 / {1 + √ (1-C 6 2 H 2)} zoom lens satisfies the. 7. The zoom lens according to claim 4, wherein the refractive index of the material of the second lens is n ₂ , the Abbe number of the material of the fourth lens: ν ₄ , and the Abbe number of the material of the seventh lens. : Ν
₇ satisfies the following condition: (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0. 8. The zoom lens according to claim 1, wherein the object side surface of the fourth lens is an aspherical surface. 9. The zoom lens according to claim 8, wherein the radius of curvature of the object side surface and the image side surface of the sixth lens is r _12.
And _{r 13} is the condition _{(4) -1.4 <(r 12} + r 13) / (r 12 -r 13) <- zoom lens satisfies the 0.9. 10. The zoom lens according to claim 8, wherein the X-axis is taken with the direction toward the image side as the origin from the intersection of the fourth lens with the optical axis on the object side surface, and the height in the direction orthogonal to the optical axis. S: Take H and calculate the reciprocal of the radius of curvature on the optical axis as C ₇ (= 1 /
r ₇ ), the object side surface: X ₇ (H) and C ₇
But the condition _{(9) X 7 (H)} <C 7 H 2 / {1 + √ (1-C 7 2 H 2)} zoom lens satisfies the. 11. The zoom lens according to claim 8, wherein the second lens material has a refractive index of n ₂ , the fourth lens material has an Abbe number: ν ₄ , and the seventh lens material has an Abbe number. : Ν
₇ satisfies the following condition: (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0. 12. The zoom lens according to claim 1, wherein the fourth lens has an aspheric image side surface. 13. The zoom lens according to claim 12, wherein a radius of curvature of the object side surface and the image side surface of the sixth lens is r _12.
And _{r 13} is the condition _{(4) -1.4 <(r 12} + r 13) / (r 12 -r 13) <- zoom lens satisfies the 0.9. 14. The zoom lens according to claim 12, wherein the X-axis is taken with the direction toward the image side as the origin at the intersection of the fourth lens with the optical axis on the image side, and the height in the direction orthogonal to the optical axis. S: Take H and calculate the reciprocal of the radius of curvature on the optical axis as C ₈ (= 1 /
r ₈ ), the object side surface: X ₈ (H) and C ₈
But the condition _{(10) X 8 (H)} > C 8 H 2 / {1 + √ (1-C 8 2 H 2)} zoom lens satisfies the. 15. The zoom lens according to claim 12, wherein the second lens material has a refractive index of n ₂ , the fourth lens material has an Abbe number: ν ₄ , and the seventh lens material has an Abbe number. : Ν
₇ satisfies the following condition: (5) n ₂ > 1.75 (6) ν ₄ > 55.0 (7) ν ₇ > 60.0. 16. A first group having a positive focal length is placed on the object side,
A second lens unit having a negative focal length is arranged on the image side,
In a zoom lens that changes magnification by changing the distance between the second group, the first group is a first lens that is a positive meniscus lens having a convex surface facing the object side in order from the object side, and a second lens that is a biconcave lens. And a fourth lens which is a biconvex lens. The second group is a positive meniscus lens having a convex surface facing the image side in order from the object side. A fifth lens, a sixth lens that is a negative lens, and a seventh lens that is a negative meniscus lens having a convex surface facing the image side are arranged. The focal length of the entire system at the long focal end: f _T , the focal point of the first group distance: _{f 1,} the focal length of the second lens group: _{f 2,} first, second group interval at the long focal _{end: d} 7 ₊ d _8T is, the condition _{(1) 0.27 <f 1 /} f T <0. _{31 (2 ') (d 7} + d 8T) / f T <0.035 (3 -1.1 _<satisfies f ₂ / f 1 <-0.9, zoom lens, characterized by have a 2.5 times higher zoom ratio.